It thrives on wetness and is a fungus that can grow indoors and out. Small spores suspended in the air land on moist surfaces, proliferating to form mould colonies. How many times have we already heard about mould in a house? But what is it, exactly? Possibly not. It can be scary to discover those dark mould areas in your basement or shower. Before jumping into Mould removal in Toronto, know about the danger of mould.